Improvement in implement for under-cutting  sand-cores in flasks



w. L.. McDOWELL.

Implement for undercutting Sand Cores in Flasks.

Patented Feb. '22, 1870.

Vila-ceases N. Pumas. Phololflhjagraphu, wnwngm. o. c

.4; lot-text "fittttt t it - Letters Patent .No. 100,172, dated February22, 18 70.

IMPROVEMENT IN IIVIPLEMENI' FOR UNDER-CUTTING SAND-CORES IN FLASKS.

The Schedule referred to in these Letters Patent and making part f likeS e- I,'W1LLIAM L. MCDOWELL, of the city of Philadelphia, in the Stateof Pennsylvania, have in vented ceitain Improvements in the Implementfor Under- (lutting or lndenting Sand-Cores in the Process of illdoldingfor Castings, of which the following is a specication.

Nature and Objects of the Invention.

In the process of molding patterns in sand-flasks it often becomesnecessary either to under-cut or indent by hand certain parts of suchcores as are molded and lifted with the coping, or to make the coresseparately and insert them in cavities molded for the purpose in thecoping. In molding for the production of the projccting lips of thelifter-cavities in the lids of the stoveplates, the former mode isgenerally adopted but it;

accurately and firmly over the projecting core to be under-cut orindented, and then compressing the spring the tongue will immediately becaused to penetrate the side of the core and thus make the under-cut orindentation required, and on then relaxing the pressure on the spring,its reaction will instantly withdraw the said tongue and allow theimplement to be'removed. Description of the Accompanying Drawings.

Figure 1 is a vertical longitudinal central section of my improvedimplement as constructed for making the under-cuts or indentations inthe sand-cores required in molding for the lifter cavities in the lidsof stoveplates.

Figure 3 is a representation of the under sideot' the implement.

Figure 2 is a view of the upper side of the same, having the bow of thespring cut off in order to more fully display the tongue. 1

General Description. A is the plate,-and a its cavity for receiving thesand-core;

B the slide and b its tongue; and

to lay down flat upon the upper, side of the plate A," whilstthe tongue5 comes fl'ush'with the under surface of the same. (Seefig. 1.)

The slide B with its tongue b is kept in line with the length of theopening in the plate A by the side edges of the. said slide and theguide-ribs a stud,'a of the plate, a slot, Zr",.in the slide B, 211-lowing the latterto'be' moved freely forward and backward within certainrequired limits.

On the upper side of the slide B there is althumli' or finger-lug, bf",for operating the slide and .to which lug one'end of the bow-spring O isriveted fast.

on the top of the cover of the cavity a there is a like lug, a whichforms an abutment for the thumb or finger of the operator in compressingthe spring, 0,

the other end of'the latter being riveted fast either to it or to theside of the cover of a, as in fig. 1.

It will now be-lll'itlelstoull, without further descrip- -tion, thatwhen this implement is placed and held firmly in juxtaposition over thecore for which it is constructed, and the slide B then pressed forwardbycompressing'the spring 0 between ones thumb and.

finger, the tongue I) of the said slide will penetrate the sand-core inat until it reaches the position indicated by the dotted lines 1 c', andthen on allowing the spring 0 to react the said tongue will be withdrawnfrom the core thereby and the implement removed by the operator, leavingthe under-cut or indentation required int-he core, the whole operationrequiring but a few moments of time, but little skill, and resulting inthe production of more perfect work than can be accomplished by eitherof the old methods.

I claim as my invention 1 The combination with the plate A, providedwith suitable cavity, a, for the'reception of the core ofthe slidingtong-ucbi and spring 0, substantially as and for the purposehereinbefore set foith.

' WM. L. MCDOWELL.

Witnesses:

' BENJ. Momson,

J onn Mnnnmnn.

a on the upper side of the plate A, while the said slide .B is,-' keptdown upon the plate A by means of a flanged.-

